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  2. Penrose stairs - Wikipedia

    en.wikipedia.org/wiki/Penrose_stairs

    The Penrose stairs or Penrose steps, also dubbed the impossible staircase, is an impossible object created by Oscar Reutersvärd in 1937 [1][2][3][4] and later independently discovered and made popular by Lionel Penrose and his son Roger Penrose. [5] A variation on the Penrose triangle, it is a two-dimensional depiction of a staircase in which ...

  3. Ascending and Descending - Wikipedia

    en.wikipedia.org/wiki/Ascending_and_Descending

    Ascending and Descending was influenced by, and is an artistic implementation of, the Penrose stairs, an impossible object; Lionel Penrose had first published his concept in the February 1958 issue of the British Journal of Psychology. Escher developed the theme further in his print Waterfall, which appeared in 1961. [2]

  4. List of optical illusions - Wikipedia

    en.wikipedia.org/wiki/List_of_optical_illusions

    The Penrose stairs was created by Lionel Penrose and his son Roger Penrose. [3] A variation on the Penrose triangle , it is a two-dimensional depiction of a staircase in which the stairs make four 90-degree turns as they ascend or descend yet form a continuous loop, so that a person could climb them forever and never get any higher.

  5. Roger Penrose - Wikipedia

    en.wikipedia.org/wiki/Roger_Penrose

    Roger Penrose. Sir Roger Penrose (born 8 August 1931) [1] is a British mathematician, mathematical physicist, philosopher of science and Nobel Laureate in Physics. [2] He is Emeritus Rouse Ball Professor of Mathematics in the University of Oxford, an emeritus fellow of Wadham College, Oxford, and an honorary fellow of St John's College ...

  6. Penrose triangle - Wikipedia

    en.wikipedia.org/wiki/Penrose_triangle

    The Penrose triangle, also known as the Penrose tribar, the impossible tribar, [1] or the impossible triangle, [2] is a triangular impossible object, an optical illusion consisting of an object which can be depicted in a perspective drawing. It cannot exist as a solid object in ordinary three-dimensional Euclidean space, although its surface ...

  7. Relativity (M. C. Escher) - Wikipedia

    en.wikipedia.org/wiki/Relativity_(M._C._Escher)

    Relativity is a lithograph print by the Dutch artist M. C. Escher, first printed in December 1953. The first version of this work was a woodcut made earlier that same year. [1] It depicts a world in which the normal laws of gravity do not apply. The architectural structure seems to be the centre of an idyllic community, with most of its ...

  8. Oscar Reutersvärd - Wikipedia

    en.wikipedia.org/wiki/Oscar_Reutersvärd

    In 1937, he created his first impossible stairs, and the concept that would lead to the impossible fork. Subsequently, he focused on academics. Subsequently, he focused on academics. In 1958, he read the now classic article by Lionel and Roger Penrose on impossible objects, [ 2 ] which included the triangle and staircase that the British father ...

  9. Optical illusion - Wikipedia

    en.wikipedia.org/wiki/Optical_illusion

    Optical illusion is also used in film by the technique of forced perspective. Op art is a style of art that uses optical illusions to create an impression of movement, or hidden images and patterns. Trompe-l'œil uses realistic imagery to create the optical illusion that depicted objects exist in three dimensions.